[Bug 788754] New: block pipeline at PREROLLED in wayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788754

            Bug ID: 788754
           Summary: block pipeline at PREROLLED in wayland
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: yeye2017 at 163.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 361214
  --> https://bugzilla.gnome.org/attachment.cgi?id=361214&action=edit
fix pipeline block at PREROLLED bug.

environment:
  GST_GL_WINDOW=wayland
  GST_GL_PLATFORM=egl

pipeline:
  gst-launch-1.0 playbin uri=file:///home/ye/test.MOV video-sink=glimagesink

issue:
  sometimes, pipeline block at PREROLLED, about one-twentieth probability.

try:
  I found that "done" value changed too late because has entered the next
cycle, so I try to add little delay after dispatching queue, pipeline block
issue disappeared. detail please ref to patch.
  it's a stupid solution since I'm clueless. Do you have any good ideal to fix
this issue?

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